Isis, which premiered January 5, 1677, at St. Germain-en-Laye, was the fifth of Jean-Baptiste Lully's tragédies lyriques written with librettist Philippe Quinault. The plot is loosely adapted from one of the episodes in Ovid's Metamorphoses. In many of its essentials, the plot of Isis resembles that of Lully's previous opera, Atys. In Isis, the nymph Io, daughter of the river Inachus, is promised in marriage to Hierax, just as the nymph Sangaride, daughter of the river Sangar, was promised to Celoenus. Like Sangaride, Io is pursued by another love and yields to this love in spite of her feelings of guilt. Like Sangaride, Io has a goddess as a rival and is vulnerable to her jealousy. Lully's contemporaries interpreted this story as representing the volatile situation between two of the King's mistresses. The subsequent scandale of the premiere ended the collaboration between Lully and Quinault for a time, and led to the dismissal of a number of members of Lully's artistic circle.

Libretto of the opera "Isis," by Philippe Quinolt. The music of the opera was composed by Jean-Baptiste Lully's and premiered on January 5, 1677 at St. Germain-en-Laye. The libretto is a loose adaptation of one of the episodes in Ovid's Metamorphoses. The plot resembles that of Lully's previous opera, Atys. It is set in pastoral and divine realms. In the opera, Jupiter courts the nymph Io, and jealous Juno imprisons her under the hundred watchful eyes of Argus. The god Mercury helps Io to escape and turns Hiérax, Io's former lover, into a bird when he tries to interfere. Then, Juno orders a Fury to torment Io. After a series of tortures, Io invokes Jupiter who interferes with Juno promising he will be faithful to her in exchange of her sparing Io. Juno then transforms Io into the Egyptian goddess Isis. On the title page for this opera, there is a lithograph illustration of the god Apollo holding a lyre and the goddess Euterpe playing a stringed instrument that resembles a guitar. It also depicts the fleur de lis, and on the background, an allegorical image Louis XIV, the Sun King.